Stock for screw-cutting dies



(No Model.)

J. J. HARRISON. STOCK FOR SCREW CUTTING DIES.

Patented July 3.1894..

Witwen@ UNITED STATES PATENT OFFICE.

JOHN J. HARRISON, OE EXCELSIOR, MINNESOTA.

lSTOCK FORv SCREWfCUTTING DIES.

SPECIFICATION forming partof Letters Patent No. 522,206, dated July 3, 1894.

Application tiled August 31, 1893. Serial No. 484.431. (No model.)

To all whom t may con/cern.-

Be it known that I, JOHN J. HARRISON, of the townA of Excelsior, county of Hennepin, and State of Minnesota, have invented a certain new and useful Improvement in Stocks lfor Screw-Cutting Dies, of which the following is a specification.

My invention relates to the provision of means for operating the thread-cutting dies ior forming screw-threads on bolts, dto., and its principal objects are, first, the providing of a detachable stock portion, and, second, the providing of means whereby the remainlng single hand-stock may be used for operating the cutting devices. The dies ori/cut.- ters thus used may be of any usual or suitable character, as my improvements relate solely to the means for actuating them.

It is one of the principal objects of the invention to devise such construction as will enable one of the arms to be detached if the device is to be used where complete revolutions of the arms are impracticable, and to operate the remaining arm eectually in ad Vance movements only. My improvements, hereinbefore suggested 1n ageneral way only, will be hereinafter specitically described and particularly pointed out in the appended claim.

In the accompanying drawings illustrating my improvements Figurehis a plan view of the device; Fig. 2 asimilar view with the faceplate removed; Fig. 3 a central longitudinal.

ting dies 5 used inthe ring maybeof any usual or suitable kind. As shown they are of the kind well-known as the Wiley d: Russel in which the die is two-part and adjustable by means of taper-headed screws 6, for governing the size of the cuts.

In the present arrangement the dies, instead -of being screwed to the ring 2 are attached by the screws 6 to a ring 7 which has on its periphery teeth 8; and between this and the handle 1, in a space provided for the purpose, are provided dogs 9 for engaging the teeth 8, and these dogs may be controlled by setscrews 10, `a slide, or other suitable means, whereby the effective operation of the device may be controlled, so that the dogs maybe made to ride over the teeth when the handle is turned in one direction and one ot' them made to engage the teeth when turned in opposite direction. There are numbers of wellknown ratchet devices operated 'and controlled` by springs, dogs, screws, slides, dro., which might with little change be adapted to my present devices forrthe purposes named; and what has been shown is designed merely to illustrate one of the forms of devices applicable to the improvements.

For ordinary use, where the tool can be continuously revolved both handles maybe used, the detachable handle being secured as indicated in Figs. 1 and 2, or by equivalent means permitting its ready removal; and when threads are to be cut under conditions precluding or rendering inconvenient the cornplete revolution of the stock, the detachable portion 3 may be removed and the remaining portion (shown in Fig. 4) used eectively, by reason of the ratchet devices, by forward and backward movement of the stock-handle 1.

Having described my invention, what I claim' is The combination, with screw-cutting dies, of a stock carried by one of two handles theother of which spans the stock and is detachably connected thereto by set-screws, and a ratchetand-dog device connecting the permanent handle with the dies, substantiallyas set forth. I

l JOHN J. HARRISON. Witnesses: Y

F. S. LYON, P. H. GUNOKEL. 

